/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <signal.h> #include <unistd.h> #include "async.h" #include "manager.h" #include "unit.h" #include "service.h" #include "load-fragment.h" #include "load-dropin.h" #include "log.h" #include "strv.h" #include "unit-name.h" #include "unit-printf.h" #include "dbus-service.h" #include "special.h" #include "exit-status.h" #include "def.h" #include "path-util.h" #include "util.h" #include "utf8.h" #include "env-util.h" #include "fileio.h" #include "bus-error.h" #include "bus-util.h" #include "bus-kernel.h" #include "formats-util.h" #include "process-util.h" #include "signal-util.h" static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = { [SERVICE_DEAD] = UNIT_INACTIVE, [SERVICE_START_PRE] = UNIT_ACTIVATING, [SERVICE_START] = UNIT_ACTIVATING, [SERVICE_START_POST] = UNIT_ACTIVATING, [SERVICE_RUNNING] = UNIT_ACTIVE, [SERVICE_EXITED] = UNIT_ACTIVE, [SERVICE_RELOAD] = UNIT_RELOADING, [SERVICE_STOP] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGABRT] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_STOP_POST] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_FAILED] = UNIT_FAILED, [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING }; /* For Type=idle we never want to delay any other jobs, hence we * consider idle jobs active as soon as we start working on them */ static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = { [SERVICE_DEAD] = UNIT_INACTIVE, [SERVICE_START_PRE] = UNIT_ACTIVE, [SERVICE_START] = UNIT_ACTIVE, [SERVICE_START_POST] = UNIT_ACTIVE, [SERVICE_RUNNING] = UNIT_ACTIVE, [SERVICE_EXITED] = UNIT_ACTIVE, [SERVICE_RELOAD] = UNIT_RELOADING, [SERVICE_STOP] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGABRT] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_STOP_POST] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_FAILED] = UNIT_FAILED, [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING }; static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata); static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata); static void service_enter_signal(Service *s, ServiceState state, ServiceResult f); static void service_enter_reload_by_notify(Service *s); static void service_init(Unit *u) { Service *s = SERVICE(u); assert(u); assert(u->load_state == UNIT_STUB); s->timeout_start_usec = u->manager->default_timeout_start_usec; s->timeout_stop_usec = u->manager->default_timeout_stop_usec; s->restart_usec = u->manager->default_restart_usec; s->type = _SERVICE_TYPE_INVALID; s->socket_fd = -1; s->bus_endpoint_fd = -1; s->stdin_fd = s->stdout_fd = s->stderr_fd = -1; s->guess_main_pid = true; RATELIMIT_INIT(s->start_limit, u->manager->default_start_limit_interval, u->manager->default_start_limit_burst); s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; } static void service_unwatch_control_pid(Service *s) { assert(s); if (s->control_pid <= 0) return; unit_unwatch_pid(UNIT(s), s->control_pid); s->control_pid = 0; } static void service_unwatch_main_pid(Service *s) { assert(s); if (s->main_pid <= 0) return; unit_unwatch_pid(UNIT(s), s->main_pid); s->main_pid = 0; } static void service_unwatch_pid_file(Service *s) { if (!s->pid_file_pathspec) return; log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path); path_spec_unwatch(s->pid_file_pathspec); path_spec_done(s->pid_file_pathspec); s->pid_file_pathspec = mfree(s->pid_file_pathspec); } static int service_set_main_pid(Service *s, pid_t pid) { pid_t ppid; assert(s); if (pid <= 1) return -EINVAL; if (pid == getpid()) return -EINVAL; if (s->main_pid == pid && s->main_pid_known) return 0; if (s->main_pid != pid) { service_unwatch_main_pid(s); exec_status_start(&s->main_exec_status, pid); } s->main_pid = pid; s->main_pid_known = true; if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid()) { log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid); s->main_pid_alien = true; } else s->main_pid_alien = false; return 0; } static void service_close_socket_fd(Service *s) { assert(s); s->socket_fd = asynchronous_close(s->socket_fd); } static void service_connection_unref(Service *s) { assert(s); if (!UNIT_ISSET(s->accept_socket)) return; socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket))); unit_ref_unset(&s->accept_socket); } static void service_stop_watchdog(Service *s) { assert(s); s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source); s->watchdog_timestamp = DUAL_TIMESTAMP_NULL; } static void service_start_watchdog(Service *s) { int r; assert(s); if (s->watchdog_usec <= 0) return; if (s->watchdog_event_source) { r = sd_event_source_set_time(s->watchdog_event_source, s->watchdog_timestamp.monotonic + s->watchdog_usec); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m"); return; } r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT); } else { r = sd_event_add_time( UNIT(s)->manager->event, &s->watchdog_event_source, CLOCK_MONOTONIC, s->watchdog_timestamp.monotonic + s->watchdog_usec, 0, service_dispatch_watchdog, s); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m"); return; } (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog"); /* Let's process everything else which might be a sign * of living before we consider a service died. */ r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE); } if (r < 0) log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m"); } static void service_reset_watchdog(Service *s) { assert(s); dual_timestamp_get(&s->watchdog_timestamp); service_start_watchdog(s); } static void service_fd_store_unlink(ServiceFDStore *fs) { if (!fs) return; if (fs->service) { assert(fs->service->n_fd_store > 0); LIST_REMOVE(fd_store, fs->service->fd_store, fs); fs->service->n_fd_store--; } if (fs->event_source) { sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF); sd_event_source_unref(fs->event_source); } free(fs->fdname); safe_close(fs->fd); free(fs); } static void service_release_resources(Unit *u) { Service *s = SERVICE(u); assert(s); if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0) return; log_unit_debug(u, "Releasing all resources."); s->stdin_fd = safe_close(s->stdin_fd); s->stdout_fd = safe_close(s->stdout_fd); s->stderr_fd = safe_close(s->stderr_fd); while (s->fd_store) service_fd_store_unlink(s->fd_store); assert(s->n_fd_store == 0); } static void service_done(Unit *u) { Service *s = SERVICE(u); assert(s); s->pid_file = mfree(s->pid_file); s->status_text = mfree(s->status_text); s->reboot_arg = mfree(s->reboot_arg); s->exec_runtime = exec_runtime_unref(s->exec_runtime); exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX); s->control_command = NULL; s->main_command = NULL; exit_status_set_free(&s->restart_prevent_status); exit_status_set_free(&s->restart_force_status); exit_status_set_free(&s->success_status); /* This will leak a process, but at least no memory or any of * our resources */ service_unwatch_main_pid(s); service_unwatch_control_pid(s); service_unwatch_pid_file(s); if (s->bus_name) { unit_unwatch_bus_name(u, s->bus_name); s->bus_name = mfree(s->bus_name); } s->bus_endpoint_fd = safe_close(s->bus_endpoint_fd); service_close_socket_fd(s); service_connection_unref(s); unit_ref_unset(&s->accept_socket); service_stop_watchdog(s); s->timer_event_source = sd_event_source_unref(s->timer_event_source); service_release_resources(u); } static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) { ServiceFDStore *fs = userdata; assert(e); assert(fs); /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */ service_fd_store_unlink(fs); return 0; } static int service_add_fd_store(Service *s, int fd, const char *name) { ServiceFDStore *fs; int r; assert(s); assert(fd >= 0); if (s->n_fd_store >= s->n_fd_store_max) return 0; LIST_FOREACH(fd_store, fs, s->fd_store) { r = same_fd(fs->fd, fd); if (r < 0) return r; if (r > 0) { /* Already included */ safe_close(fd); return 1; } } fs = new0(ServiceFDStore, 1); if (!fs) return -ENOMEM; fs->fd = fd; fs->service = s; fs->fdname = strdup(name ?: "stored"); if (!fs->fdname) { free(fs); return -ENOMEM; } r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs); if (r < 0) { free(fs->fdname); free(fs); return r; } (void) sd_event_source_set_description(fs->event_source, "service-fd-store"); LIST_PREPEND(fd_store, s->fd_store, fs); s->n_fd_store++; return 1; } static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) { int r; assert(s); if (fdset_size(fds) <= 0) return 0; while (s->n_fd_store < s->n_fd_store_max) { _cleanup_close_ int fd = -1; fd = fdset_steal_first(fds); if (fd < 0) break; r = service_add_fd_store(s, fd, name); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Couldn't add fd to fd store: %m"); if (r > 0) { log_unit_debug(UNIT(s), "Added fd to fd store."); fd = -1; } } if (fdset_size(fds) > 0) log_unit_warning(UNIT(s), "Tried to store more fds than FDStoreMax=%u allows, closing remaining.", s->n_fd_store_max); return 0; } static int service_arm_timer(Service *s, usec_t usec) { int r; assert(s); if (s->timer_event_source) { r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + usec); if (r < 0) return r; return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); } r = sd_event_add_time( UNIT(s)->manager->event, &s->timer_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + usec, 0, service_dispatch_timer, s); if (r < 0) return r; (void) sd_event_source_set_description(s->timer_event_source, "service-timer"); return 0; } static int service_verify(Service *s) { assert(s); if (UNIT(s)->load_state != UNIT_LOADED) return 0; if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]) { log_unit_error(UNIT(s), "Service lacks both ExecStart= and ExecStop= setting. Refusing."); return -EINVAL; } if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) { log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing."); return -EINVAL; } if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START]) { log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for RemainAfterExit=yes services. Refusing."); return -EINVAL; } if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) { log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing."); return -EINVAL; } if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) { log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing."); return -EINVAL; } if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) { log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing."); return -EINVAL; } if (s->type == SERVICE_DBUS && !s->bus_name) { log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing."); return -EINVAL; } if (s->bus_name && s->type != SERVICE_DBUS) log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring."); if (s->exec_context.pam_name && !(s->kill_context.kill_mode == KILL_CONTROL_GROUP || s->kill_context.kill_mode == KILL_MIXED)) { log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing."); return -EINVAL; } if (s->usb_function_descriptors && !s->usb_function_strings) log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring."); if (!s->usb_function_descriptors && s->usb_function_strings) log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring."); return 0; } static int service_add_default_dependencies(Service *s) { int r; assert(s); /* Add a number of automatic dependencies useful for the * majority of services. */ /* First, pull in base system */ r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_BASIC_TARGET, NULL, true); if (r < 0) return r; /* Second, activate normal shutdown */ return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); } static void service_fix_output(Service *s) { assert(s); /* If nothing has been explicitly configured, patch default * output in. If input is socket/tty we avoid this however, * since in that case we want output to default to the same * place as we read input from. */ if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT && s->exec_context.std_output == EXEC_OUTPUT_INHERIT && s->exec_context.std_input == EXEC_INPUT_NULL) s->exec_context.std_error = UNIT(s)->manager->default_std_error; if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT && s->exec_context.std_input == EXEC_INPUT_NULL) s->exec_context.std_output = UNIT(s)->manager->default_std_output; } static int service_add_extras(Service *s) { int r; assert(s); if (s->type == _SERVICE_TYPE_INVALID) { /* Figure out a type automatically */ if (s->bus_name) s->type = SERVICE_DBUS; else if (s->exec_command[SERVICE_EXEC_START]) s->type = SERVICE_SIMPLE; else s->type = SERVICE_ONESHOT; } /* Oneshot services have disabled start timeout by default */ if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined) s->timeout_start_usec = 0; service_fix_output(s); r = unit_patch_contexts(UNIT(s)); if (r < 0) return r; r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); if (r < 0) return r; r = unit_set_default_slice(UNIT(s)); if (r < 0) return r; if (s->type == SERVICE_NOTIFY && s->notify_access == NOTIFY_NONE) s->notify_access = NOTIFY_MAIN; if (s->watchdog_usec > 0 && s->notify_access == NOTIFY_NONE) s->notify_access = NOTIFY_MAIN; if (s->bus_name) { const char *n; n = strjoina(s->bus_name, ".busname"); r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, n, NULL, true); if (r < 0) return r; r = unit_watch_bus_name(UNIT(s), s->bus_name); if (r == -EEXIST) return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name); } if (UNIT(s)->default_dependencies) { r = service_add_default_dependencies(s); if (r < 0) return r; } return 0; } static int service_load(Unit *u) { Service *s = SERVICE(u); int r; assert(s); /* Load a .service file */ r = unit_load_fragment(u); if (r < 0) return r; /* Still nothing found? Then let's give up */ if (u->load_state == UNIT_STUB) return -ENOENT; /* This is a new unit? Then let's add in some extras */ if (u->load_state == UNIT_LOADED) { /* We were able to load something, then let's add in * the dropin directories. */ r = unit_load_dropin(u); if (r < 0) return r; /* This is a new unit? Then let's add in some * extras */ r = service_add_extras(s); if (r < 0) return r; } return service_verify(s); } static void service_dump(Unit *u, FILE *f, const char *prefix) { ServiceExecCommand c; Service *s = SERVICE(u); const char *prefix2; assert(s); prefix = strempty(prefix); prefix2 = strjoina(prefix, "\t"); fprintf(f, "%sService State: %s\n" "%sResult: %s\n" "%sReload Result: %s\n" "%sPermissionsStartOnly: %s\n" "%sRootDirectoryStartOnly: %s\n" "%sRemainAfterExit: %s\n" "%sGuessMainPID: %s\n" "%sType: %s\n" "%sRestart: %s\n" "%sNotifyAccess: %s\n" "%sNotifyState: %s\n", prefix, service_state_to_string(s->state), prefix, service_result_to_string(s->result), prefix, service_result_to_string(s->reload_result), prefix, yes_no(s->permissions_start_only), prefix, yes_no(s->root_directory_start_only), prefix, yes_no(s->remain_after_exit), prefix, yes_no(s->guess_main_pid), prefix, service_type_to_string(s->type), prefix, service_restart_to_string(s->restart), prefix, notify_access_to_string(s->notify_access), prefix, notify_state_to_string(s->notify_state)); if (s->control_pid > 0) fprintf(f, "%sControl PID: "PID_FMT"\n", prefix, s->control_pid); if (s->main_pid > 0) fprintf(f, "%sMain PID: "PID_FMT"\n" "%sMain PID Known: %s\n" "%sMain PID Alien: %s\n", prefix, s->main_pid, prefix, yes_no(s->main_pid_known), prefix, yes_no(s->main_pid_alien)); if (s->pid_file) fprintf(f, "%sPIDFile: %s\n", prefix, s->pid_file); if (s->bus_name) fprintf(f, "%sBusName: %s\n" "%sBus Name Good: %s\n", prefix, s->bus_name, prefix, yes_no(s->bus_name_good)); kill_context_dump(&s->kill_context, f, prefix); exec_context_dump(&s->exec_context, f, prefix); for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) { if (!s->exec_command[c]) continue; fprintf(f, "%s-> %s:\n", prefix, service_exec_command_to_string(c)); exec_command_dump_list(s->exec_command[c], f, prefix2); } if (s->status_text) fprintf(f, "%sStatus Text: %s\n", prefix, s->status_text); if (s->n_fd_store_max > 0) fprintf(f, "%sFile Descriptor Store Max: %u\n" "%sFile Descriptor Store Current: %u\n", prefix, s->n_fd_store_max, prefix, s->n_fd_store); } static int service_load_pid_file(Service *s, bool may_warn) { _cleanup_free_ char *k = NULL; int r; pid_t pid; assert(s); if (!s->pid_file) return -ENOENT; r = read_one_line_file(s->pid_file, &k); if (r < 0) { if (may_warn) log_unit_info_errno(UNIT(s), r, "PID file %s not readable (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state)); return r; } r = parse_pid(k, &pid); if (r < 0) { if (may_warn) log_unit_info_errno(UNIT(s), r, "Failed to read PID from file %s: %m", s->pid_file); return r; } if (!pid_is_alive(pid)) { if (may_warn) log_unit_info(UNIT(s), "PID "PID_FMT" read from file %s does not exist or is a zombie.", pid, s->pid_file); return -ESRCH; } if (s->main_pid_known) { if (pid == s->main_pid) return 0; log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid); service_unwatch_main_pid(s); s->main_pid_known = false; } else log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid); r = service_set_main_pid(s, pid); if (r < 0) return r; r = unit_watch_pid(UNIT(s), pid); if (r < 0) { /* FIXME: we need to do something here */ log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid); return r; } return 0; } static int service_search_main_pid(Service *s) { pid_t pid = 0; int r; assert(s); /* If we know it anyway, don't ever fallback to unreliable * heuristics */ if (s->main_pid_known) return 0; if (!s->guess_main_pid) return 0; assert(s->main_pid <= 0); r = unit_search_main_pid(UNIT(s), &pid); if (r < 0) return r; log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid); r = service_set_main_pid(s, pid); if (r < 0) return r; r = unit_watch_pid(UNIT(s), pid); if (r < 0) { /* FIXME: we need to do something here */ log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid); return r; } return 0; } static void service_set_state(Service *s, ServiceState state) { ServiceState old_state; const UnitActiveState *table; assert(s); table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table; old_state = s->state; s->state = state; service_unwatch_pid_file(s); if (!IN_SET(state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, SERVICE_AUTO_RESTART)) s->timer_event_source = sd_event_source_unref(s->timer_event_source); if (!IN_SET(state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) { service_unwatch_main_pid(s); s->main_command = NULL; } if (!IN_SET(state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) { service_unwatch_control_pid(s); s->control_command = NULL; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; } if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) unit_unwatch_all_pids(UNIT(s)); if (!IN_SET(state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) && !(state == SERVICE_DEAD && UNIT(s)->job)) { service_close_socket_fd(s); service_connection_unref(s); } if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) service_stop_watchdog(s); /* For the inactive states unit_notify() will trim the cgroup, * but for exit we have to do that ourselves... */ if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0) unit_prune_cgroup(UNIT(s)); /* For remain_after_exit services, let's see if we can "release" the * hold on the console, since unit_notify() only does that in case of * change of state */ if (state == SERVICE_EXITED && s->remain_after_exit && UNIT(s)->manager->n_on_console > 0) { ExecContext *ec; ec = unit_get_exec_context(UNIT(s)); if (ec && exec_context_may_touch_console(ec)) { Manager *m = UNIT(s)->manager; m->n_on_console --; if (m->n_on_console == 0) /* unset no_console_output flag, since the console is free */ m->no_console_output = false; } } if (old_state != state) log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state)); unit_notify(UNIT(s), table[old_state], table[state], s->reload_result == SERVICE_SUCCESS); } static int service_coldplug(Unit *u) { Service *s = SERVICE(u); int r; assert(s); assert(s->state == SERVICE_DEAD); if (s->deserialized_state != s->state) { if (IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) { usec_t k; k = IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec; /* For the start/stop timeouts 0 means off */ if (k > 0) { r = service_arm_timer(s, k); if (r < 0) return r; } } if (s->deserialized_state == SERVICE_AUTO_RESTART) { /* The restart timeouts 0 means immediately */ r = service_arm_timer(s, s->restart_usec); if (r < 0) return r; } if (pid_is_unwaited(s->main_pid) && ((s->deserialized_state == SERVICE_START && IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_ONESHOT, SERVICE_NOTIFY)) || IN_SET(s->deserialized_state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) { r = unit_watch_pid(UNIT(s), s->main_pid); if (r < 0) return r; } if (pid_is_unwaited(s->control_pid) && IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) { r = unit_watch_pid(UNIT(s), s->control_pid); if (r < 0) return r; } if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) unit_watch_all_pids(UNIT(s)); if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) service_start_watchdog(s); service_set_state(s, s->deserialized_state); } return 0; } static int service_collect_fds(Service *s, int **fds, char ***fd_names) { _cleanup_strv_free_ char **rfd_names = NULL; _cleanup_free_ int *rfds = NULL; int rn_fds = 0, r; assert(s); assert(fds); assert(fd_names); if (s->socket_fd >= 0) { /* Pass the per-connection socket */ rfds = new(int, 1); if (!rfds) return -ENOMEM; rfds[0] = s->socket_fd; rfd_names = strv_new("connection", NULL); if (!rfd_names) return -ENOMEM; rn_fds = 1; } else { Iterator i; Unit *u; /* Pass all our configured sockets for singleton services */ SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) { _cleanup_free_ int *cfds = NULL; Socket *sock; int cn_fds; if (u->type != UNIT_SOCKET) continue; sock = SOCKET(u); cn_fds = socket_collect_fds(sock, &cfds); if (cn_fds < 0) return cn_fds; if (cn_fds <= 0) continue; if (!rfds) { rfds = cfds; rn_fds = cn_fds; cfds = NULL; } else { int *t; t = realloc(rfds, (rn_fds + cn_fds) * sizeof(int)); if (!t) return -ENOMEM; memcpy(t + rn_fds, cfds, cn_fds * sizeof(int)); rfds = t; rn_fds += cn_fds; } r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds); if (r < 0) return r; } } if (s->n_fd_store > 0) { ServiceFDStore *fs; char **nl; int *t; t = realloc(rfds, (rn_fds + s->n_fd_store) * sizeof(int)); if (!t) return -ENOMEM; rfds = t; nl = realloc(rfd_names, (rn_fds + s->n_fd_store + 1) * sizeof(char*)); if (!nl) return -ENOMEM; rfd_names = nl; LIST_FOREACH(fd_store, fs, s->fd_store) { rfds[rn_fds] = fs->fd; rfd_names[rn_fds] = strdup(strempty(fs->fdname)); if (!rfd_names[rn_fds]) return -ENOMEM; rn_fds++; } rfd_names[rn_fds] = NULL; } *fds = rfds; *fd_names = rfd_names; rfds = NULL; rfd_names = NULL; return rn_fds; } static int service_spawn( Service *s, ExecCommand *c, usec_t timeout, bool pass_fds, bool apply_permissions, bool apply_chroot, bool apply_tty_stdin, bool is_control, pid_t *_pid) { _cleanup_strv_free_ char **argv = NULL, **final_env = NULL, **our_env = NULL, **fd_names = NULL; _cleanup_free_ char *bus_endpoint_path = NULL; _cleanup_free_ int *fds = NULL; unsigned n_fds = 0, n_env = 0; const char *path; pid_t pid; ExecParameters exec_params = { .apply_permissions = apply_permissions, .apply_chroot = apply_chroot, .apply_tty_stdin = apply_tty_stdin, .bus_endpoint_fd = -1, .stdin_fd = -1, .stdout_fd = -1, .stderr_fd = -1, }; int r; assert(s); assert(c); assert(_pid); (void) unit_realize_cgroup(UNIT(s)); if (s->reset_cpu_usage) { (void) unit_reset_cpu_usage(UNIT(s)); s->reset_cpu_usage = false; } r = unit_setup_exec_runtime(UNIT(s)); if (r < 0) goto fail; if (pass_fds || s->exec_context.std_input == EXEC_INPUT_SOCKET || s->exec_context.std_output == EXEC_OUTPUT_SOCKET || s->exec_context.std_error == EXEC_OUTPUT_SOCKET) { r = service_collect_fds(s, &fds, &fd_names); if (r < 0) goto fail; n_fds = r; } if (timeout > 0) { r = service_arm_timer(s, timeout); if (r < 0) goto fail; } else s->timer_event_source = sd_event_source_unref(s->timer_event_source); r = unit_full_printf_strv(UNIT(s), c->argv, &argv); if (r < 0) goto fail; our_env = new0(char*, 6); if (!our_env) { r = -ENOMEM; goto fail; } if (is_control ? s->notify_access == NOTIFY_ALL : s->notify_access != NOTIFY_NONE) if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) { r = -ENOMEM; goto fail; } if (s->main_pid > 0) if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) { r = -ENOMEM; goto fail; } if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid()) < 0) { r = -ENOMEM; goto fail; } if (s->socket_fd >= 0) { union sockaddr_union sa; socklen_t salen = sizeof(sa); r = getpeername(s->socket_fd, &sa.sa, &salen); if (r < 0) { r = -errno; goto fail; } if (IN_SET(sa.sa.sa_family, AF_INET, AF_INET6)) { _cleanup_free_ char *addr = NULL; char *t; int port; r = sockaddr_pretty(&sa.sa, salen, true, false, &addr); if (r < 0) goto fail; t = strappend("REMOTE_ADDR=", addr); if (!t) { r = -ENOMEM; goto fail; } our_env[n_env++] = t; port = sockaddr_port(&sa.sa); if (port < 0) { r = port; goto fail; } if (asprintf(&t, "REMOTE_PORT=%u", port) < 0) { r = -ENOMEM; goto fail; } our_env[n_env++] = t; } } final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL); if (!final_env) { r = -ENOMEM; goto fail; } if (is_control && UNIT(s)->cgroup_path) { path = strjoina(UNIT(s)->cgroup_path, "/control"); (void) cg_create(SYSTEMD_CGROUP_CONTROLLER, path); } else path = UNIT(s)->cgroup_path; if (s->exec_context.bus_endpoint) { r = bus_kernel_create_endpoint(UNIT(s)->manager->running_as == MANAGER_SYSTEM ? "system" : "user", UNIT(s)->id, &bus_endpoint_path); if (r < 0) goto fail; /* Pass the fd to the exec_params so that the child process can upload the policy. * Keep a reference to the fd in the service, so the endpoint is kept alive as long * as the service is running. */ exec_params.bus_endpoint_fd = s->bus_endpoint_fd = r; } exec_params.argv = argv; exec_params.fds = fds; exec_params.fd_names = fd_names; exec_params.n_fds = n_fds; exec_params.environment = final_env; exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; exec_params.cgroup_path = path; exec_params.cgroup_delegate = s->cgroup_context.delegate; exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); exec_params.watchdog_usec = s->watchdog_usec; exec_params.bus_endpoint_path = bus_endpoint_path; exec_params.selinux_context_net = s->socket_fd_selinux_context_net; if (s->type == SERVICE_IDLE) exec_params.idle_pipe = UNIT(s)->manager->idle_pipe; exec_params.stdin_fd = s->stdin_fd; exec_params.stdout_fd = s->stdout_fd; exec_params.stderr_fd = s->stderr_fd; r = exec_spawn(UNIT(s), c, &s->exec_context, &exec_params, s->exec_runtime, &pid); if (r < 0) goto fail; r = unit_watch_pid(UNIT(s), pid); if (r < 0) /* FIXME: we need to do something here */ goto fail; *_pid = pid; return 0; fail: if (timeout) s->timer_event_source = sd_event_source_unref(s->timer_event_source); return r; } static int main_pid_good(Service *s) { assert(s); /* Returns 0 if the pid is dead, 1 if it is good, -1 if we * don't know */ /* If we know the pid file, then let's just check if it is * still valid */ if (s->main_pid_known) { /* If it's an alien child let's check if it is still * alive ... */ if (s->main_pid_alien && s->main_pid > 0) return pid_is_alive(s->main_pid); /* .. otherwise assume we'll get a SIGCHLD for it, * which we really should wait for to collect exit * status and code */ return s->main_pid > 0; } /* We don't know the pid */ return -EAGAIN; } _pure_ static int control_pid_good(Service *s) { assert(s); return s->control_pid > 0; } static int cgroup_good(Service *s) { int r; assert(s); if (!UNIT(s)->cgroup_path) return 0; r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path); if (r < 0) return r; return !r; } static bool service_shall_restart(Service *s) { assert(s); /* Don't restart after manual stops */ if (s->forbid_restart) return false; /* Never restart if this is configured as special exception */ if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status)) return false; /* Restart if the exit code/status are configured as restart triggers */ if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status)) return true; switch (s->restart) { case SERVICE_RESTART_NO: return false; case SERVICE_RESTART_ALWAYS: return true; case SERVICE_RESTART_ON_SUCCESS: return s->result == SERVICE_SUCCESS; case SERVICE_RESTART_ON_FAILURE: return s->result != SERVICE_SUCCESS; case SERVICE_RESTART_ON_ABNORMAL: return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE); case SERVICE_RESTART_ON_WATCHDOG: return s->result == SERVICE_FAILURE_WATCHDOG; case SERVICE_RESTART_ON_ABORT: return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP); default: assert_not_reached("unknown restart setting"); } } static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) { int r; assert(s); if (f != SERVICE_SUCCESS) s->result = f; service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD); if (s->result != SERVICE_SUCCESS) { log_unit_warning(UNIT(s), "Failed with result '%s'.", service_result_to_string(s->result)); failure_action(UNIT(s)->manager, s->failure_action, s->reboot_arg); } if (allow_restart && service_shall_restart(s)) { r = service_arm_timer(s, s->restart_usec); if (r < 0) goto fail; service_set_state(s, SERVICE_AUTO_RESTART); } /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */ s->forbid_restart = false; /* We want fresh tmpdirs in case service is started again immediately */ exec_runtime_destroy(s->exec_runtime); s->exec_runtime = exec_runtime_unref(s->exec_runtime); /* Also, remove the runtime directory in */ exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); /* Try to delete the pid file. At this point it will be * out-of-date, and some software might be confused by it, so * let's remove it. */ if (s->pid_file) unlink_noerrno(s->pid_file); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m"); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false); } static void service_enter_stop_post(Service *s, ServiceResult f) { int r; assert(s); if (f != SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); unit_watch_all_pids(UNIT(s)); s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_STOP_POST; r = service_spawn(s, s->control_command, s->timeout_stop_usec, false, !s->permissions_start_only, !s->root_directory_start_only, true, true, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_STOP_POST); } else service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m"); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); } static int state_to_kill_operation(ServiceState state) { switch (state) { case SERVICE_STOP_SIGABRT: return KILL_ABORT; case SERVICE_STOP_SIGTERM: case SERVICE_FINAL_SIGTERM: return KILL_TERMINATE; case SERVICE_STOP_SIGKILL: case SERVICE_FINAL_SIGKILL: return KILL_KILL; default: return _KILL_OPERATION_INVALID; } } static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) { int r; assert(s); if (f != SERVICE_SUCCESS) s->result = f; unit_watch_all_pids(UNIT(s)); r = unit_kill_context( UNIT(s), &s->kill_context, state_to_kill_operation(state), s->main_pid, s->control_pid, s->main_pid_alien); if (r < 0) goto fail; if (r > 0) { if (s->timeout_stop_usec > 0) { r = service_arm_timer(s, s->timeout_stop_usec); if (r < 0) goto fail; } service_set_state(s, state); } else if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill) service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS); else if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL)) service_enter_stop_post(s, SERVICE_SUCCESS); else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill) service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS); else service_enter_dead(s, SERVICE_SUCCESS, true); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL)) service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES); else service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); } static void service_enter_stop_by_notify(Service *s) { assert(s); unit_watch_all_pids(UNIT(s)); if (s->timeout_stop_usec > 0) service_arm_timer(s, s->timeout_stop_usec); /* The service told us it's stopping, so it's as if we SIGTERM'd it. */ service_set_state(s, SERVICE_STOP_SIGTERM); } static void service_enter_stop(Service *s, ServiceResult f) { int r; assert(s); if (f != SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); unit_watch_all_pids(UNIT(s)); s->control_command = s->exec_command[SERVICE_EXEC_STOP]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_STOP; r = service_spawn(s, s->control_command, s->timeout_stop_usec, false, !s->permissions_start_only, !s->root_directory_start_only, false, true, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_STOP); } else service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m"); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); } static bool service_good(Service *s) { int main_pid_ok; assert(s); if (s->type == SERVICE_DBUS && !s->bus_name_good) return false; main_pid_ok = main_pid_good(s); if (main_pid_ok > 0) /* It's alive */ return true; if (main_pid_ok == 0) /* It's dead */ return false; /* OK, we don't know anything about the main PID, maybe * because there is none. Let's check the control group * instead. */ return cgroup_good(s) != 0; } static void service_enter_running(Service *s, ServiceResult f) { assert(s); if (f != SERVICE_SUCCESS) s->result = f; if (service_good(s)) { /* If there are any queued up sd_notify() * notifications, process them now */ if (s->notify_state == NOTIFY_RELOADING) service_enter_reload_by_notify(s); else if (s->notify_state == NOTIFY_STOPPING) service_enter_stop_by_notify(s); else service_set_state(s, SERVICE_RUNNING); } else if (s->remain_after_exit) service_set_state(s, SERVICE_EXITED); else service_enter_stop(s, SERVICE_SUCCESS); } static void service_enter_start_post(Service *s) { int r; assert(s); service_unwatch_control_pid(s); service_reset_watchdog(s); s->control_command = s->exec_command[SERVICE_EXEC_START_POST]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_START_POST; r = service_spawn(s, s->control_command, s->timeout_start_usec, false, !s->permissions_start_only, !s->root_directory_start_only, false, true, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_START_POST); } else service_enter_running(s, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m"); service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static void service_kill_control_processes(Service *s) { char *p; if (!UNIT(s)->cgroup_path) return; p = strjoina(UNIT(s)->cgroup_path, "/control"); cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, p, SIGKILL, true, true, true, NULL); } static void service_enter_start(Service *s) { ExecCommand *c; pid_t pid; int r; assert(s); service_unwatch_control_pid(s); service_unwatch_main_pid(s); /* We want to ensure that nobody leaks processes from * START_PRE here, so let's go on a killing spree, People * should not spawn long running processes from START_PRE. */ service_kill_control_processes(s); if (s->type == SERVICE_FORKING) { s->control_command_id = SERVICE_EXEC_START; c = s->control_command = s->exec_command[SERVICE_EXEC_START]; s->main_command = NULL; } else { s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; s->control_command = NULL; c = s->main_command = s->exec_command[SERVICE_EXEC_START]; } if (!c) { assert(s->type == SERVICE_ONESHOT); service_enter_start_post(s); return; } r = service_spawn(s, c, IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_ONESHOT) ? s->timeout_start_usec : 0, true, true, true, true, false, &pid); if (r < 0) goto fail; if (s->type == SERVICE_SIMPLE || s->type == SERVICE_IDLE) { /* For simple services we immediately start * the START_POST binaries. */ service_set_main_pid(s, pid); service_enter_start_post(s); } else if (s->type == SERVICE_FORKING) { /* For forking services we wait until the start * process exited. */ s->control_pid = pid; service_set_state(s, SERVICE_START); } else if (s->type == SERVICE_ONESHOT || s->type == SERVICE_DBUS || s->type == SERVICE_NOTIFY) { /* For oneshot services we wait until the start * process exited, too, but it is our main process. */ /* For D-Bus services we know the main pid right away, * but wait for the bus name to appear on the * bus. Notify services are similar. */ service_set_main_pid(s, pid); service_set_state(s, SERVICE_START); } else assert_not_reached("Unknown service type"); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m"); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); } static void service_enter_start_pre(Service *s) { int r; assert(s); service_unwatch_control_pid(s); s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]; if (s->control_command) { /* Before we start anything, let's clear up what might * be left from previous runs. */ service_kill_control_processes(s); s->control_command_id = SERVICE_EXEC_START_PRE; r = service_spawn(s, s->control_command, s->timeout_start_usec, false, !s->permissions_start_only, !s->root_directory_start_only, true, true, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_START_PRE); } else service_enter_start(s); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m"); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); } static void service_enter_restart(Service *s) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(s); if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) { /* Don't restart things if we are going down anyway */ log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart."); r = service_arm_timer(s, s->restart_usec); if (r < 0) goto fail; return; } /* Any units that are bound to this service must also be * restarted. We use JOB_RESTART (instead of the more obvious * JOB_START) here so that those dependency jobs will be added * as well. */ r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, false, &error, NULL); if (r < 0) goto fail; /* Note that we stay in the SERVICE_AUTO_RESTART state here, * it will be canceled as part of the service_stop() call that * is executed as part of JOB_RESTART. */ log_unit_debug(UNIT(s), "Scheduled restart job."); return; fail: log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r)); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false); } static void service_enter_reload_by_notify(Service *s) { assert(s); if (s->timeout_start_usec > 0) service_arm_timer(s, s->timeout_start_usec); service_set_state(s, SERVICE_RELOAD); } static void service_enter_reload(Service *s) { int r; assert(s); service_unwatch_control_pid(s); s->reload_result = SERVICE_SUCCESS; s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_RELOAD; r = service_spawn(s, s->control_command, s->timeout_start_usec, false, !s->permissions_start_only, !s->root_directory_start_only, false, true, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_RELOAD); } else service_enter_running(s, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m"); s->reload_result = SERVICE_FAILURE_RESOURCES; service_enter_running(s, SERVICE_SUCCESS); } static void service_run_next_control(Service *s) { int r; assert(s); assert(s->control_command); assert(s->control_command->command_next); assert(s->control_command_id != SERVICE_EXEC_START); s->control_command = s->control_command->command_next; service_unwatch_control_pid(s); r = service_spawn(s, s->control_command, IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec, false, !s->permissions_start_only, !s->root_directory_start_only, s->control_command_id == SERVICE_EXEC_START_PRE || s->control_command_id == SERVICE_EXEC_STOP_POST, true, &s->control_pid); if (r < 0) goto fail; return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m"); if (s->state == SERVICE_START_PRE) service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); else if (s->state == SERVICE_STOP) service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); else if (s->state == SERVICE_STOP_POST) service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); else if (s->state == SERVICE_RELOAD) { s->reload_result = SERVICE_FAILURE_RESOURCES; service_enter_running(s, SERVICE_SUCCESS); } else service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static void service_run_next_main(Service *s) { pid_t pid; int r; assert(s); assert(s->main_command); assert(s->main_command->command_next); assert(s->type == SERVICE_ONESHOT); s->main_command = s->main_command->command_next; service_unwatch_main_pid(s); r = service_spawn(s, s->main_command, s->timeout_start_usec, true, true, true, true, false, &pid); if (r < 0) goto fail; service_set_main_pid(s, pid); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m"); service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static int service_start_limit_test(Service *s) { assert(s); if (ratelimit_test(&s->start_limit)) return 0; log_unit_warning(UNIT(s), "Start request repeated too quickly."); return failure_action(UNIT(s)->manager, s->start_limit_action, s->reboot_arg); } static int service_start(Unit *u) { Service *s = SERVICE(u); int r; assert(s); /* We cannot fulfill this request right now, try again later * please! */ if (IN_SET(s->state, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) return -EAGAIN; /* Already on it! */ if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST)) return 0; /* A service that will be restarted must be stopped first to * trigger BindsTo and/or OnFailure dependencies. If a user * does not want to wait for the holdoff time to elapse, the * service should be manually restarted, not started. We * simply return EAGAIN here, so that any start jobs stay * queued, and assume that the auto restart timer will * eventually trigger the restart. */ if (s->state == SERVICE_AUTO_RESTART) return -EAGAIN; assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED)); /* Make sure we don't enter a busy loop of some kind. */ r = service_start_limit_test(s); if (r < 0) { service_enter_dead(s, SERVICE_FAILURE_START_LIMIT, false); return r; } s->result = SERVICE_SUCCESS; s->reload_result = SERVICE_SUCCESS; s->main_pid_known = false; s->main_pid_alien = false; s->forbid_restart = false; s->reset_cpu_usage = true; s->status_text = mfree(s->status_text); s->status_errno = 0; s->notify_state = NOTIFY_UNKNOWN; service_enter_start_pre(s); return 1; } static int service_stop(Unit *u) { Service *s = SERVICE(u); assert(s); /* Don't create restart jobs from manual stops. */ s->forbid_restart = true; /* Already on it */ if (IN_SET(s->state, SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) return 0; /* A restart will be scheduled or is in progress. */ if (s->state == SERVICE_AUTO_RESTART) { service_set_state(s, SERVICE_DEAD); return 0; } /* If there's already something running we go directly into * kill mode. */ if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) { service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS); return 0; } assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED)); service_enter_stop(s, SERVICE_SUCCESS); return 1; } static int service_reload(Unit *u) { Service *s = SERVICE(u); assert(s); assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED); service_enter_reload(s); return 1; } _pure_ static bool service_can_reload(Unit *u) { Service *s = SERVICE(u); assert(s); return !!s->exec_command[SERVICE_EXEC_RELOAD]; } static int service_serialize(Unit *u, FILE *f, FDSet *fds) { Service *s = SERVICE(u); ServiceFDStore *fs; int r; assert(u); assert(f); assert(fds); unit_serialize_item(u, f, "state", service_state_to_string(s->state)); unit_serialize_item(u, f, "result", service_result_to_string(s->result)); unit_serialize_item(u, f, "reload-result", service_result_to_string(s->reload_result)); if (s->control_pid > 0) unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); if (s->main_pid_known && s->main_pid > 0) unit_serialize_item_format(u, f, "main-pid", PID_FMT, s->main_pid); unit_serialize_item(u, f, "main-pid-known", yes_no(s->main_pid_known)); unit_serialize_item(u, f, "bus-name-good", yes_no(s->bus_name_good)); r = unit_serialize_item_escaped(u, f, "status-text", s->status_text); if (r < 0) return r; /* FIXME: There's a minor uncleanliness here: if there are * multiple commands attached here, we will start from the * first one again */ if (s->control_command_id >= 0) unit_serialize_item(u, f, "control-command", service_exec_command_to_string(s->control_command_id)); r = unit_serialize_item_fd(u, f, fds, "stdin-fd", s->stdin_fd); if (r < 0) return r; r = unit_serialize_item_fd(u, f, fds, "stdout-fd", s->stdout_fd); if (r < 0) return r; r = unit_serialize_item_fd(u, f, fds, "stderr-fd", s->stderr_fd); if (r < 0) return r; r = unit_serialize_item_fd(u, f, fds, "socket-fd", s->socket_fd); if (r < 0) return r; r = unit_serialize_item_fd(u, f, fds, "endpoint-fd", s->bus_endpoint_fd); if (r < 0) return r; LIST_FOREACH(fd_store, fs, s->fd_store) { _cleanup_free_ char *c = NULL; int copy; copy = fdset_put_dup(fds, fs->fd); if (copy < 0) return copy; c = cescape(fs->fdname); unit_serialize_item_format(u, f, "fd-store-fd", "%i %s", copy, strempty(c)); } if (s->main_exec_status.pid > 0) { unit_serialize_item_format(u, f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid); dual_timestamp_serialize(f, "main-exec-status-start", &s->main_exec_status.start_timestamp); dual_timestamp_serialize(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp); if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) { unit_serialize_item_format(u, f, "main-exec-status-code", "%i", s->main_exec_status.code); unit_serialize_item_format(u, f, "main-exec-status-status", "%i", s->main_exec_status.status); } } if (dual_timestamp_is_set(&s->watchdog_timestamp)) dual_timestamp_serialize(f, "watchdog-timestamp", &s->watchdog_timestamp); unit_serialize_item(u, f, "forbid-restart", yes_no(s->forbid_restart)); return 0; } static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { Service *s = SERVICE(u); int r; assert(u); assert(key); assert(value); assert(fds); if (streq(key, "state")) { ServiceState state; state = service_state_from_string(value); if (state < 0) log_unit_debug(u, "Failed to parse state value: %s", value); else s->deserialized_state = state; } else if (streq(key, "result")) { ServiceResult f; f = service_result_from_string(value); if (f < 0) log_unit_debug(u, "Failed to parse result value: %s", value); else if (f != SERVICE_SUCCESS) s->result = f; } else if (streq(key, "reload-result")) { ServiceResult f; f = service_result_from_string(value); if (f < 0) log_unit_debug(u, "Failed to parse reload result value: %s", value); else if (f != SERVICE_SUCCESS) s->reload_result = f; } else if (streq(key, "control-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse control-pid value: %s", value); else s->control_pid = pid; } else if (streq(key, "main-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse main-pid value: %s", value); else { service_set_main_pid(s, pid); unit_watch_pid(UNIT(s), pid); } } else if (streq(key, "main-pid-known")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse main-pid-known value: %s", value); else s->main_pid_known = b; } else if (streq(key, "bus-name-good")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse bus-name-good value: %s", value); else s->bus_name_good = b; } else if (streq(key, "status-text")) { char *t; r = cunescape(value, 0, &t); if (r < 0) log_unit_debug_errno(u, r, "Failed to unescape status text: %s", value); else { free(s->status_text); s->status_text = t; } } else if (streq(key, "control-command")) { ServiceExecCommand id; id = service_exec_command_from_string(value); if (id < 0) log_unit_debug(u, "Failed to parse exec-command value: %s", value); else { s->control_command_id = id; s->control_command = s->exec_command[id]; } } else if (streq(key, "socket-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse socket-fd value: %s", value); else { asynchronous_close(s->socket_fd); s->socket_fd = fdset_remove(fds, fd); } } else if (streq(key, "endpoint-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse endpoint-fd value: %s", value); else { safe_close(s->bus_endpoint_fd); s->bus_endpoint_fd = fdset_remove(fds, fd); } } else if (streq(key, "fd-store-fd")) { const char *fdv; size_t pf; int fd; pf = strcspn(value, WHITESPACE); fdv = strndupa(value, pf); if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value); else { _cleanup_free_ char *t = NULL; const char *fdn; fdn = value + pf; fdn += strspn(fdn, WHITESPACE); (void) cunescape(fdn, 0, &t); r = service_add_fd_store(s, fd, t); if (r < 0) log_unit_error_errno(u, r, "Failed to add fd to store: %m"); else if (r > 0) fdset_remove(fds, fd); } } else if (streq(key, "main-exec-status-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value); else s->main_exec_status.pid = pid; } else if (streq(key, "main-exec-status-code")) { int i; if (safe_atoi(value, &i) < 0) log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value); else s->main_exec_status.code = i; } else if (streq(key, "main-exec-status-status")) { int i; if (safe_atoi(value, &i) < 0) log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value); else s->main_exec_status.status = i; } else if (streq(key, "main-exec-status-start")) dual_timestamp_deserialize(value, &s->main_exec_status.start_timestamp); else if (streq(key, "main-exec-status-exit")) dual_timestamp_deserialize(value, &s->main_exec_status.exit_timestamp); else if (streq(key, "watchdog-timestamp")) dual_timestamp_deserialize(value, &s->watchdog_timestamp); else if (streq(key, "forbid-restart")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse forbid-restart value: %s", value); else s->forbid_restart = b; } else if (streq(key, "stdin-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stdin-fd value: %s", value); else { asynchronous_close(s->stdin_fd); s->stdin_fd = fdset_remove(fds, fd); } } else if (streq(key, "stdout-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stdout-fd value: %s", value); else { asynchronous_close(s->stdout_fd); s->stdout_fd = fdset_remove(fds, fd); } } else if (streq(key, "stderr-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stderr-fd value: %s", value); else { asynchronous_close(s->stderr_fd); s->stderr_fd = fdset_remove(fds, fd); } } else log_unit_debug(u, "Unknown serialization key: %s", key); return 0; } _pure_ static UnitActiveState service_active_state(Unit *u) { const UnitActiveState *table; assert(u); table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table; return table[SERVICE(u)->state]; } static const char *service_sub_state_to_string(Unit *u) { assert(u); return service_state_to_string(SERVICE(u)->state); } static bool service_check_gc(Unit *u) { Service *s = SERVICE(u); assert(s); /* Never clean up services that still have a process around, * even if the service is formally dead. */ if (cgroup_good(s) > 0 || main_pid_good(s) > 0 || control_pid_good(s) > 0) return true; return false; } _pure_ static bool service_check_snapshot(Unit *u) { Service *s = SERVICE(u); assert(s); return s->socket_fd < 0; } static int service_retry_pid_file(Service *s) { int r; assert(s->pid_file); assert(s->state == SERVICE_START || s->state == SERVICE_START_POST); r = service_load_pid_file(s, false); if (r < 0) return r; service_unwatch_pid_file(s); service_enter_running(s, SERVICE_SUCCESS); return 0; } static int service_watch_pid_file(Service *s) { int r; log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path); r = path_spec_watch(s->pid_file_pathspec, service_dispatch_io); if (r < 0) goto fail; /* the pidfile might have appeared just before we set the watch */ log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path); service_retry_pid_file(s); return 0; fail: log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path); service_unwatch_pid_file(s); return r; } static int service_demand_pid_file(Service *s) { PathSpec *ps; assert(s->pid_file); assert(!s->pid_file_pathspec); ps = new0(PathSpec, 1); if (!ps) return -ENOMEM; ps->unit = UNIT(s); ps->path = strdup(s->pid_file); if (!ps->path) { free(ps); return -ENOMEM; } path_kill_slashes(ps->path); /* PATH_CHANGED would not be enough. There are daemons (sendmail) that * keep their PID file open all the time. */ ps->type = PATH_MODIFIED; ps->inotify_fd = -1; s->pid_file_pathspec = ps; return service_watch_pid_file(s); } static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata) { PathSpec *p = userdata; Service *s; assert(p); s = SERVICE(p->unit); assert(s); assert(fd >= 0); assert(s->state == SERVICE_START || s->state == SERVICE_START_POST); assert(s->pid_file_pathspec); assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd)); log_unit_debug(UNIT(s), "inotify event"); if (path_spec_fd_event(p, events) < 0) goto fail; if (service_retry_pid_file(s) == 0) return 0; if (service_watch_pid_file(s) < 0) goto fail; return 0; fail: service_unwatch_pid_file(s); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); return 0; } static void service_notify_cgroup_empty_event(Unit *u) { Service *s = SERVICE(u); assert(u); log_unit_debug(u, "cgroup is empty"); switch (s->state) { /* Waiting for SIGCHLD is usually more interesting, * because it includes return codes/signals. Which is * why we ignore the cgroup events for most cases, * except when we don't know pid which to expect the * SIGCHLD for. */ case SERVICE_START: case SERVICE_START_POST: /* If we were hoping for the daemon to write its PID file, * we can give up now. */ if (s->pid_file_pathspec) { log_unit_warning(u, "Daemon never wrote its PID file. Failing."); service_unwatch_pid_file(s); if (s->state == SERVICE_START) service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); else service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } break; case SERVICE_RUNNING: /* service_enter_running() will figure out what to do */ service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP_SIGABRT: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (main_pid_good(s) <= 0 && !control_pid_good(s)) service_enter_stop_post(s, SERVICE_SUCCESS); break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (main_pid_good(s) <= 0 && !control_pid_good(s)) service_enter_dead(s, SERVICE_SUCCESS, true); break; default: ; } } static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { Service *s = SERVICE(u); ServiceResult f; assert(s); assert(pid >= 0); if (UNIT(s)->fragment_path ? is_clean_exit(code, status, &s->success_status) : is_clean_exit_lsb(code, status, &s->success_status)) f = SERVICE_SUCCESS; else if (code == CLD_EXITED) f = SERVICE_FAILURE_EXIT_CODE; else if (code == CLD_KILLED) f = SERVICE_FAILURE_SIGNAL; else if (code == CLD_DUMPED) f = SERVICE_FAILURE_CORE_DUMP; else assert_not_reached("Unknown code"); if (s->main_pid == pid) { /* Forking services may occasionally move to a new PID. * As long as they update the PID file before exiting the old * PID, they're fine. */ if (service_load_pid_file(s, false) == 0) return; s->main_pid = 0; exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status); if (s->main_command) { /* If this is not a forking service than the * main process got started and hence we copy * the exit status so that it is recorded both * as main and as control process exit * status */ s->main_command->exec_status = s->main_exec_status; if (s->main_command->ignore) f = SERVICE_SUCCESS; } else if (s->exec_command[SERVICE_EXEC_START]) { /* If this is a forked process, then we should * ignore the return value if this was * configured for the starter process */ if (s->exec_command[SERVICE_EXEC_START]->ignore) f = SERVICE_SUCCESS; } log_struct(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, LOG_UNIT_ID(u), LOG_UNIT_MESSAGE(u, "Main process exited, code=%s, status=%i/%s", sigchld_code_to_string(code), status, strna(code == CLD_EXITED ? exit_status_to_string(status, EXIT_STATUS_FULL) : signal_to_string(status))), "EXIT_CODE=%s", sigchld_code_to_string(code), "EXIT_STATUS=%i", status, NULL); if (f != SERVICE_SUCCESS) s->result = f; if (s->main_command && s->main_command->command_next && f == SERVICE_SUCCESS) { /* There is another command to * * execute, so let's do that. */ log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state)); service_run_next_main(s); } else { /* The service exited, so the service is officially * gone. */ s->main_command = NULL; switch (s->state) { case SERVICE_START_POST: case SERVICE_RELOAD: case SERVICE_STOP: /* Need to wait until the operation is * done */ break; case SERVICE_START: if (s->type == SERVICE_ONESHOT) { /* This was our main goal, so let's go on */ if (f == SERVICE_SUCCESS) service_enter_start_post(s); else service_enter_signal(s, SERVICE_FINAL_SIGTERM, f); break; } /* Fall through */ case SERVICE_RUNNING: service_enter_running(s, f); break; case SERVICE_STOP_SIGABRT: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (!control_pid_good(s)) service_enter_stop_post(s, f); /* If there is still a control process, wait for that first */ break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (!control_pid_good(s)) service_enter_dead(s, f, true); break; default: assert_not_reached("Uh, main process died at wrong time."); } } } else if (s->control_pid == pid) { s->control_pid = 0; if (s->control_command) { exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); if (s->control_command->ignore) f = SERVICE_SUCCESS; } log_unit_full(u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); if (f != SERVICE_SUCCESS) s->result = f; /* Immediately get rid of the cgroup, so that the * kernel doesn't delay the cgroup empty messages for * the service cgroup any longer than necessary */ service_kill_control_processes(s); if (s->control_command && s->control_command->command_next && f == SERVICE_SUCCESS) { /* There is another command to * * execute, so let's do that. */ log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state)); service_run_next_control(s); } else { /* No further commands for this step, so let's * figure out what to do next */ s->control_command = NULL; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state)); switch (s->state) { case SERVICE_START_PRE: if (f == SERVICE_SUCCESS) service_enter_start(s); else service_enter_signal(s, SERVICE_FINAL_SIGTERM, f); break; case SERVICE_START: if (s->type != SERVICE_FORKING) /* Maybe spurious event due to a reload that changed the type? */ break; if (f != SERVICE_SUCCESS) { service_enter_signal(s, SERVICE_FINAL_SIGTERM, f); break; } if (s->pid_file) { bool has_start_post; int r; /* Let's try to load the pid file here if we can. * The PID file might actually be created by a START_POST * script. In that case don't worry if the loading fails. */ has_start_post = !!s->exec_command[SERVICE_EXEC_START_POST]; r = service_load_pid_file(s, !has_start_post); if (!has_start_post && r < 0) { r = service_demand_pid_file(s); if (r < 0 || !cgroup_good(s)) service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); break; } } else (void) service_search_main_pid(s); service_enter_start_post(s); break; case SERVICE_START_POST: if (f != SERVICE_SUCCESS) { service_enter_stop(s, f); break; } if (s->pid_file) { int r; r = service_load_pid_file(s, true); if (r < 0) { r = service_demand_pid_file(s); if (r < 0 || !cgroup_good(s)) service_enter_stop(s, SERVICE_FAILURE_RESOURCES); break; } } else (void) service_search_main_pid(s); service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_RELOAD: if (f == SERVICE_SUCCESS) { service_load_pid_file(s, true); (void) service_search_main_pid(s); } s->reload_result = f; service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP: service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; case SERVICE_STOP_SIGABRT: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (main_pid_good(s) <= 0) service_enter_stop_post(s, f); /* If there is still a service * process around, wait until * that one quit, too */ break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (main_pid_good(s) <= 0) service_enter_dead(s, f, true); break; default: assert_not_reached("Uh, control process died at wrong time."); } } } /* Notify clients about changed exit status */ unit_add_to_dbus_queue(u); /* We got one SIGCHLD for the service, let's watch all * processes that are now running of the service, and watch * that. Among the PIDs we then watch will be children * reassigned to us, which hopefully allows us to identify * when all children are gone */ unit_tidy_watch_pids(u, s->main_pid, s->control_pid); unit_watch_all_pids(u); /* If the PID set is empty now, then let's finish this off */ if (set_isempty(u->pids)) service_notify_cgroup_empty_event(u); } static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { Service *s = SERVICE(userdata); assert(s); assert(source == s->timer_event_source); switch (s->state) { case SERVICE_START_PRE: case SERVICE_START: log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre"); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_START_POST: log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping."); service_enter_stop(s, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_RELOAD: log_unit_warning(UNIT(s), "Reload operation timed out. Stopping."); service_unwatch_control_pid(s); service_kill_control_processes(s); s->reload_result = SERVICE_FAILURE_TIMEOUT; service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP: log_unit_warning(UNIT(s), "Stopping timed out. Terminating."); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_SIGABRT: log_unit_warning(UNIT(s), "State 'stop-sigabrt' timed out. Terminating."); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing."); service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL."); service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT); } break; case SERVICE_STOP_SIGKILL: /* Uh, we sent a SIGKILL and it is still not gone? * Must be something we cannot kill, so let's just be * weirded out and continue */ log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring."); service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_POST: log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating."); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_FINAL_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing."); service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode."); service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false); } break; case SERVICE_FINAL_SIGKILL: log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode."); service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true); break; case SERVICE_AUTO_RESTART: log_unit_info(UNIT(s), s->restart_usec > 0 ? "Service hold-off time over, scheduling restart." : "Service has no hold-off time, scheduling restart."); service_enter_restart(s); break; default: assert_not_reached("Timeout at wrong time."); } return 0; } static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) { Service *s = SERVICE(userdata); char t[FORMAT_TIMESPAN_MAX]; assert(s); assert(source == s->watchdog_event_source); log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!", format_timespan(t, sizeof(t), s->watchdog_usec, 1)); service_enter_signal(s, SERVICE_STOP_SIGABRT, SERVICE_FAILURE_WATCHDOG); return 0; } static void service_notify_message(Unit *u, pid_t pid, char **tags, FDSet *fds) { Service *s = SERVICE(u); _cleanup_free_ char *cc = NULL; bool notify_dbus = false; const char *e; assert(u); cc = strv_join(tags, ", "); if (s->notify_access == NOTIFY_NONE) { log_unit_warning(u, "Got notification message from PID "PID_FMT", but reception is disabled.", pid); return; } else if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) { if (s->main_pid != 0) log_unit_warning(u, "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid); else log_unit_debug(u, "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid); return; } else log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", pid, isempty(cc) ? "n/a" : cc); /* Interpret MAINPID= */ e = strv_find_startswith(tags, "MAINPID="); if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) { if (parse_pid(e, &pid) < 0) log_unit_warning(u, "Failed to parse MAINPID= field in notification message: %s", e); else { service_set_main_pid(s, pid); unit_watch_pid(UNIT(s), pid); notify_dbus = true; } } /* Interpret RELOADING= */ if (strv_find(tags, "RELOADING=1")) { s->notify_state = NOTIFY_RELOADING; if (s->state == SERVICE_RUNNING) service_enter_reload_by_notify(s); notify_dbus = true; } /* Interpret READY= */ if (strv_find(tags, "READY=1")) { s->notify_state = NOTIFY_READY; /* Type=notify services inform us about completed * initialization with READY=1 */ if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START) service_enter_start_post(s); /* Sending READY=1 while we are reloading informs us * that the reloading is complete */ if (s->state == SERVICE_RELOAD && s->control_pid == 0) service_enter_running(s, SERVICE_SUCCESS); notify_dbus = true; } /* Interpret STOPPING= */ if (strv_find(tags, "STOPPING=1")) { s->notify_state = NOTIFY_STOPPING; if (s->state == SERVICE_RUNNING) service_enter_stop_by_notify(s); notify_dbus = true; } /* Interpret STATUS= */ e = strv_find_startswith(tags, "STATUS="); if (e) { _cleanup_free_ char *t = NULL; if (!isempty(e)) { if (!utf8_is_valid(e)) log_unit_warning(u, "Status message in notification message is not UTF-8 clean."); else { t = strdup(e); if (!t) log_oom(); } } if (!streq_ptr(s->status_text, t)) { free(s->status_text); s->status_text = t; t = NULL; notify_dbus = true; } } /* Interpret ERRNO= */ e = strv_find_startswith(tags, "ERRNO="); if (e) { int status_errno; if (safe_atoi(e, &status_errno) < 0 || status_errno < 0) log_unit_warning(u, "Failed to parse ERRNO= field in notification message: %s", e); else { if (s->status_errno != status_errno) { s->status_errno = status_errno; notify_dbus = true; } } } /* Interpret WATCHDOG= */ if (strv_find(tags, "WATCHDOG=1")) service_reset_watchdog(s); if (strv_find(tags, "FDSTORE=1")) { const char *name; name = strv_find_startswith(tags, "FDNAME="); if (name && !fdname_is_valid(name)) { log_unit_warning(u, "Passed FDNAME= name is invalid, ignoring."); name = NULL; } service_add_fd_store_set(s, fds, name); } /* Notify clients about changed status or main pid */ if (notify_dbus) unit_add_to_dbus_queue(u); } static int service_get_timeout(Unit *u, uint64_t *timeout) { Service *s = SERVICE(u); int r; if (!s->timer_event_source) return 0; r = sd_event_source_get_time(s->timer_event_source, timeout); if (r < 0) return r; return 1; } static void service_bus_name_owner_change( Unit *u, const char *name, const char *old_owner, const char *new_owner) { Service *s = SERVICE(u); int r; assert(s); assert(name); assert(streq(s->bus_name, name)); assert(old_owner || new_owner); if (old_owner && new_owner) log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner); else if (old_owner) log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner); else log_unit_debug(u, "D-Bus name %s now registered by %s", name, new_owner); s->bus_name_good = !!new_owner; if (s->type == SERVICE_DBUS) { /* service_enter_running() will figure out what to * do */ if (s->state == SERVICE_RUNNING) service_enter_running(s, SERVICE_SUCCESS); else if (s->state == SERVICE_START && new_owner) service_enter_start_post(s); } else if (new_owner && s->main_pid <= 0 && (s->state == SERVICE_START || s->state == SERVICE_START_POST || s->state == SERVICE_RUNNING || s->state == SERVICE_RELOAD)) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; pid_t pid; /* Try to acquire PID from bus service */ r = sd_bus_get_name_creds(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds); if (r >= 0) r = sd_bus_creds_get_pid(creds, &pid); if (r >= 0) { log_unit_debug(u, "D-Bus name %s is now owned by process %u", name, (unsigned) pid); service_set_main_pid(s, pid); unit_watch_pid(UNIT(s), pid); } } } int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) { _cleanup_free_ char *peer = NULL; int r; assert(s); assert(fd >= 0); /* This is called by the socket code when instantiating a new * service for a stream socket and the socket needs to be * configured. */ if (UNIT(s)->load_state != UNIT_LOADED) return -EINVAL; if (s->socket_fd >= 0) return -EBUSY; if (s->state != SERVICE_DEAD) return -EAGAIN; if (getpeername_pretty(fd, &peer) >= 0) { if (UNIT(s)->description) { _cleanup_free_ char *a; a = strjoin(UNIT(s)->description, " (", peer, ")", NULL); if (!a) return -ENOMEM; r = unit_set_description(UNIT(s), a); } else r = unit_set_description(UNIT(s), peer); if (r < 0) return r; } s->socket_fd = fd; s->socket_fd_selinux_context_net = selinux_context_net; unit_ref_set(&s->accept_socket, UNIT(sock)); return unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false); } static void service_reset_failed(Unit *u) { Service *s = SERVICE(u); assert(s); if (s->state == SERVICE_FAILED) service_set_state(s, SERVICE_DEAD); s->result = SERVICE_SUCCESS; s->reload_result = SERVICE_SUCCESS; RATELIMIT_RESET(s->start_limit); } static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { Service *s = SERVICE(u); return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error); } static const char* const service_restart_table[_SERVICE_RESTART_MAX] = { [SERVICE_RESTART_NO] = "no", [SERVICE_RESTART_ON_SUCCESS] = "on-success", [SERVICE_RESTART_ON_FAILURE] = "on-failure", [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal", [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog", [SERVICE_RESTART_ON_ABORT] = "on-abort", [SERVICE_RESTART_ALWAYS] = "always", }; DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart); static const char* const service_type_table[_SERVICE_TYPE_MAX] = { [SERVICE_SIMPLE] = "simple", [SERVICE_FORKING] = "forking", [SERVICE_ONESHOT] = "oneshot", [SERVICE_DBUS] = "dbus", [SERVICE_NOTIFY] = "notify", [SERVICE_IDLE] = "idle" }; DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType); static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = { [SERVICE_EXEC_START_PRE] = "ExecStartPre", [SERVICE_EXEC_START] = "ExecStart", [SERVICE_EXEC_START_POST] = "ExecStartPost", [SERVICE_EXEC_RELOAD] = "ExecReload", [SERVICE_EXEC_STOP] = "ExecStop", [SERVICE_EXEC_STOP_POST] = "ExecStopPost", }; DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand); static const char* const notify_access_table[_NOTIFY_ACCESS_MAX] = { [NOTIFY_NONE] = "none", [NOTIFY_MAIN] = "main", [NOTIFY_ALL] = "all" }; DEFINE_STRING_TABLE_LOOKUP(notify_access, NotifyAccess); static const char* const notify_state_table[_NOTIFY_STATE_MAX] = { [NOTIFY_UNKNOWN] = "unknown", [NOTIFY_READY] = "ready", [NOTIFY_RELOADING] = "reloading", [NOTIFY_STOPPING] = "stopping", }; DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState); static const char* const service_result_table[_SERVICE_RESULT_MAX] = { [SERVICE_SUCCESS] = "success", [SERVICE_FAILURE_RESOURCES] = "resources", [SERVICE_FAILURE_TIMEOUT] = "timeout", [SERVICE_FAILURE_EXIT_CODE] = "exit-code", [SERVICE_FAILURE_SIGNAL] = "signal", [SERVICE_FAILURE_CORE_DUMP] = "core-dump", [SERVICE_FAILURE_WATCHDOG] = "watchdog", [SERVICE_FAILURE_START_LIMIT] = "start-limit" }; DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult); const UnitVTable service_vtable = { .object_size = sizeof(Service), .exec_context_offset = offsetof(Service, exec_context), .cgroup_context_offset = offsetof(Service, cgroup_context), .kill_context_offset = offsetof(Service, kill_context), .exec_runtime_offset = offsetof(Service, exec_runtime), .sections = "Unit\0" "Service\0" "Install\0", .private_section = "Service", .init = service_init, .done = service_done, .load = service_load, .release_resources = service_release_resources, .coldplug = service_coldplug, .dump = service_dump, .start = service_start, .stop = service_stop, .reload = service_reload, .can_reload = service_can_reload, .kill = service_kill, .serialize = service_serialize, .deserialize_item = service_deserialize_item, .active_state = service_active_state, .sub_state_to_string = service_sub_state_to_string, .check_gc = service_check_gc, .check_snapshot = service_check_snapshot, .sigchld_event = service_sigchld_event, .reset_failed = service_reset_failed, .notify_cgroup_empty = service_notify_cgroup_empty_event, .notify_message = service_notify_message, .bus_name_owner_change = service_bus_name_owner_change, .bus_vtable = bus_service_vtable, .bus_set_property = bus_service_set_property, .bus_commit_properties = bus_service_commit_properties, .get_timeout = service_get_timeout, .can_transient = true, .status_message_formats = { .starting_stopping = { [0] = "Starting %s...", [1] = "Stopping %s...", }, .finished_start_job = { [JOB_DONE] = "Started %s.", [JOB_FAILED] = "Failed to start %s.", }, .finished_stop_job = { [JOB_DONE] = "Stopped %s.", [JOB_FAILED] = "Stopped (with error) %s.", }, }, };